206 FOREST TREES. 
principally composed of alburnum, or sap wood. It 
shrinks and warps badly, and speedily decays when 
exposed to the weather. It is one of the least valua- 
ble of the Pines for timber, and for ornamental pur- 
poses is inferior to many other species of its genus. 
6. Pinus ponderosa—Heavy-wooded Pine. 
Leaves, nine to twelve inches long, broad, twisted, 
crowded; color, deep green; sheaths, short; cones, 
three and a-half inches long, ovate, reflexed, clustered ; 
peduncles, short; scales, tipped with a small, sharp, 
recurved prickle; seeds, with long wings. 
This species, from the Pacific coast, is a large tree, 
very hardy and of rapid growth. The wood is very 
heavy, and is said to be of great excellence. As 
far as tested, this tree has succeeded well in the State 
of Illinois, but, like other species from our western 
coast, it is not yet common in cultivation. 
Pinus australis, the Long-leaved Pine of the 
Southern States, ranks next to the White Pine in 
usefulness, but does not come within the limits of 
this work. P. macrocarpa, P. Sabiniana, and others 
of this section are as yet imperfectly tested, and not 
generally known. 
SECTION BINA. 
TWO LEAVES IN A SHEATH. 
% Pinus sylvestris—Scotch Pine. 
Leaves, twisted, rigid, one and a-half to three in- 
ches long; color, light bluish-green; sheaths, short; 
